It's not the first time an Obama family member has voiced support for a gay athlete. Last year, when NBA veteran Jason Collins announced he was gay, President Obama himself addressed the issue in remarks during a news conference, calling Collins a role model.
"I had a chance to talk to (Collins) ... he seems like a terrific young man. I told him I couldn't be prouder of him," the president said:
Collins, too, tweeted supportive words for Sam:
For the past 2 days I have met with @MikeSamFootball here in LA. He is a great young man who has shown tremendous courage and leadership